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INDIAN WELLS, CA - MARCH 13: Stanislas Wawrinka of Switzerland plays a forehand against Philipp Kohlschreiber of Germany in their third round match during day eight of the BNP Paribas Open at Indian Wells Tennis Garden on March 13, 2017 in Indian Wells, California. (Photo by Clive Brunskill/Getty Images)

INDIAN WELLS, CA - MARCH 13:  Stanislas Wawrinka of Switzerland plays a forehand against Philipp Kohlschreiber of Germany in their third round match during day eight of the BNP Paribas Open at Indian Wells Tennis Garden on March 13, 2017 in Indian Wells, California.  (Photo by Clive Brunskill/Getty Images)